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Production method of polymeric chelating agent capable of being used for removing various heavy metal ions in wastewater

A technology of polymer chelating agent and heavy metal ions, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of unreasonable raw material ratio, long reaction time, high reaction temperature, etc., and achieve good flocculation Precipitation effect, obvious effect, effect of lowering reaction temperature

Active Publication Date: 2015-12-30
青岛中科荣达新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0027] The present invention solves the problems of unreasonable raw material proportioning, high reaction temperature, long reaction time, high product cost, increased yield but increased cost and other problems existing in the existing dithiocarbamic acid polyethyleneimine. Proportion, reaction temperature and time, etc. are studied in depth, and the existing process is optimized to provide a production method of a polymer chelating agent that can be used to remove various heavy metal ions in wastewater, so as to achieve the following invention objectives:

Method used

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  • Production method of polymeric chelating agent capable of being used for removing various heavy metal ions in wastewater
  • Production method of polymeric chelating agent capable of being used for removing various heavy metal ions in wastewater
  • Production method of polymeric chelating agent capable of being used for removing various heavy metal ions in wastewater

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Effect test

Embodiment 1

[0056] Embodiment 1 A kind of production method that can be used for removing the polymer chelating agent of multiple heavy metal ions in waste water

[0057] The synthesis reaction of the polymer chelating agent is carried out in a 1500L enamel kettle.

[0058] The polymer chelating agent is polyethylenimine dithiocarbamate.

[0059] (1) Carbon disulfide high tank feeding

[0060] Use compressed air to press 98.5kg (1296mol) carbon disulfide from the storage tank to the carbon disulfide high level tank, and keep the height of the upper water layer of the carbon disulfide high level tank at 10-15mm.

[0061] (2) Synthetic kettle feeding

[0062] 630kg (35000mol) of deionized water, 190kg of industrial NaOH with a mass concentration of 30% (the molar number of NaOH is 1425mol) was sequentially pumped into the synthesis kettle by vacuum, and 0.08kg of 4-dimethylaminopyridine (DMAP), 0.12kg of 1- (3-Dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC), start stirring, ...

Embodiment 2

[0080] Embodiment 2 A kind of production method that can be used for removing the polymer chelating agent of multiple heavy metal ions in waste water

[0081] The synthesis reaction of the polymer chelating agent is carried out in a 1500L enamel kettle.

[0082] The polymer chelating agent is polyethylenimine dithiocarbamate.

[0083] (1) Carbon disulfide high tank feeding

[0084] Use compressed air to press 99.5kg (1309mol) carbon disulfide from the storage tank to the carbon disulfide header tank, and keep the height of the water layer at the upper part of the carbon disulfide header tank at 10-15mm.

[0085] (2) Synthetic kettle feeding

[0086] 640kg (35555mol) of deionized water, 200kg of industrial NaOH with a mass concentration of 30% (the molar number of NaOH is 1500mol) was sequentially pumped into the synthesis kettle by vacuum, and 0.10kg of 4-dimethylaminopyridine (DMAP), 0.14kg of 1- (3-Dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC), start stirri...

Embodiment 3

[0102] Embodiment 3 A kind of production method that can be used for removing the polymer chelating agent of multiple heavy metal ions in waste water

[0103] The synthesis reaction of the polymer chelating agent is carried out in a 1500L enamel kettle.

[0104] The polymer chelating agent is polyethylenimine dithiocarbamate.

[0105] (1) Carbon disulfide high tank feeding

[0106] Use compressed air to press 100kg (1316mol) carbon disulfide from the storage tank to the carbon disulfide header tank, and keep the height of the water layer at the upper part of the carbon disulfide header tank at 10-15mm.

[0107] (2) Synthetic kettle feeding

[0108] 650kg (36111mol) of deionized water, 210kg of industrial NaOH with a mass concentration of 30% (the molar number of NaOH is 1575mol) was sequentially pumped into the synthesis kettle by vacuum, and 0.12kg of 4-dimethylaminopyridine (DMAP), 0.16kg of 1- (3-Dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC), start stirrin...

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Abstract

The invention provides a production method of a polymeric chelating agent capable of being used for removing various heavy metal ions in wastewater. The method comprises the steps of carbon disulfide elevated tank feeding, synthesis kettle feeding, chilled brine introduction, carbon disulfide dropwise adding and rotating speed adjustment. In the synthesis kettle feeding, the mole ratio of polyethyleneimine to NaOH is 1:0.6-0.8, and the mole ratio of polyethyleneimine to deionized water is 1:15-26. The synthesized chelating agent is brownish red transparent liquid, the density is 1.08-1.13 g / ml at 25 DEG C, the pH value (a 10% water solution) is 10.6-11.4, the viscosity is 82-90 mPa.s at 25 DEG C, and the effect of removing heavy metal ions in wastewater is good. The production method has the advantages that the reaction time is short, the reaction temperature is low, energy consumption is low, raw material matching is reasonable, the reaction is sufficient, and side reactions are significantly reduced.

Description

technical field [0001] The invention relates to a production method of a polymer chelating agent which can be used for removing various heavy metal ions in waste water, and belongs to the technical field of environmental protection. Background technique [0002] In today's increasingly serious environmental problems, heavy metal pollution in industrial wastewater pollution is particularly serious. On the one hand, heavy metal wastewater comes from a wide range of sources, including mine drainage, waste rock field leaching water, ore dressing plant tailings drainage, non-ferrous metal smelter dust removal drainage, Pickling water in non-ferrous metal processing plants, washing water in electroplating plants, pickling water in iron and steel plants, and industrial wastewater such as pesticides, medicines, paints, and pigments. [0003] Heavy metal pollution has become a major environmental problem all over the world, and the prevention and control of heavy metal pollution has ...

Claims

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Application Information

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IPC IPC(8): C08G73/04C02F1/52C02F1/62
CPCC02F1/56C02F2101/20C08G73/0206
Inventor 郭祥荣郭学阳张恭孝王璀邢星孟宪锋李孟朱颜张晓菡
Owner 青岛中科荣达新材料有限公司
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